Hydraulic spooling device



Lv BARRETT HYDRAULIC SPOQLING DEVICE June 1, 1943.

June 1, 1943,a E. R. BARRETT 2,320,554

HYDRAULIC SPOOLING DEVICE Filed Jan. 26, 1942 s sheets-sheet 2 June1943. E. R, BARRETT HYDRAULIC SPOOLING DEVICE Filed Jan. 26, 1942 3Sheets-Sheet 3 .MHHI

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IN VEN TOR Zyl/Vari ,Br/gif ATTORNEYS- Patented June 1, 1943 UNITEDSTATES PATENT OFFICE HYDRAULIC SPOOLING DEVICE Application January 26,1942, Serial No. 428,155

14 Claims.

The present invention relates to improvements in hydraulic actuatingdevices, and particularly to such devices employed in the spooling ofcable, or the like. l

One of the primary objects of the present lnvention is to providesimplified hydraulic actuating devices which are economical to constructand install.

Another object of the invention is to provide improved devices of thetype mentioned which are positive in their action.

Another object of the invention is to provide improvements inhydraulically actuating spooling devices, or level winders, for guidinga cable as it is wound on a spool, or drum, of a power driven winch insynchronism with the speed of such spool, or drum.

Another object of the invention is to provide improvements in devices ofthe type mentioned so that such devices are compact and occupyrelatively little room on the Winches on which they are employed.

Another object of the invention is to provide improvements in spoolingdevices for power driven Winches which are positive in their action evenwhen there is a relatively heavy line pull on the cable.

Other objects of the invention will become apparent from .the followingspecification, the drawings relating thereto, and from the claimshereinafter set forth.

In the drawings, in which like numerals are used to designate like partsin the several views throughout:

Figure 1 is a top plan view of a power driven winch having a spoolingdevice, or level Winder, according to the present invention associatedtherewith;

Fig. 2 is an enlarged, fragmentary cross-sectional view takensubstantially along the line 2-2 of Figure 1;

Fig. 3 is a cross-sectional view taken substantially along the line 3-3of Figure 2;

Fig. 4 is an enlarged cross-sectional View taken substantially along theline 4-4 of Figure 2;

Fig. 5 is a cross-sectional view taken substantially along the line 5-5of Figure 3;

Fig. 6 is a cross-sectional view taken substantially along the line 6 5of Figure 4;

Fig. 7 is an enlarged cross-sectional view taken substantially along theline 1-1 of Figure 2;

Fig. 8 is' a view similar .to Figure 2, and showing a modified form ofthe present invention; and

Fig. 9 is a fragmentary view similar to Figure 2, and illustratinganother modified form of the present invention.

Referring to the drawings, and referring particularly to Figures 1through 'l thereof, in which one embodiment of the present invention isillustrated, a power winch is generally indicated at l0 comprising astandard i2, having a spool or drum i4 keyed to shaft I6 for rotationtherewith. The ends of such shaft i6 are disposed in suitable bearingson the standard l2.

Such shaft I6 is driven to drive .the spool I4 through suitable means,such as a. suitable motor i8 which is operatively connected through agear reduction mechanism 20 with a driving sprocket 22. Such sprocket 22is connected to another sprocket 2d, which is keyed to the shaft i6,through a chain 26.

A cable 28 is adapted to be wound onto the spool i4 or unwoundtherefrom, and level Winder or spooling means generally indicated at 30are provided for guiding the cable 28 as it traverses the space betweenthe ends of the spool I4.

It is pointed out that the term cable as here used and as used in theclaims is intended to be generic, and includes stranded cable, singlewire. rope, and vthe like.

The level Winder 3l! is mounted upon a pair of standards 32 disposedadjacent the standards I2 and in such a position that the guide for thecable 28 reciprocates in a path substantially parallel to 'the axis ofthe shaft I6 and between the ends of the spool I4. A casing 34 isfixedly connected to one of the -standards 32 and includes a centralbore 36. A piston or plunger 38 is disposed within the bore 36 inengagement with the wall thereof, and is adapted to rotate andreciprocate therein.

In order to effect such rotation and reciprocation of the piston 38within the bore 36 of the casing 34, such piston 38 is formed with anaxial recess 40 in one end thereof which is adapted to slidably receivetherein a drive shaft 42. The plunger 38 and the drive shaft 42 areformed with axially extending, complementary grooves or recesses 44 and46, respectively. preferably at diametrically opposed points, which areadapted to receive therein balls 48. Such balls provide the rotativedriving connection between the drive 42 and the piston 38, and permitrelative axial movement therebetween.

The drive member 42 has a reduced end portion 50 which extends through asealed opening 52 formed in the outer end of the casing 34, to the outerend of which is keyed a sprocket wheel 54. The reduced end of the member42 is also to another sprocket wheel 88A through a chain 88.

Such sprocket wheel 88' is keyed to the end of the shaft I8. so that themember 42 is synchronously driven with the spool I4.

The axial movement of the piston 88 is effected by means of a continuouscam groove 88, which is now accelerating to obtain uniform movement,formed in the peripheral surface thereof, which is disposed at apredetermined angle with respect to the axis of the piston 88 and theaxis of the shaft 42, in order to effect the desired axial displacementof the piston 38 rupon rotation thereof. I'his axial movement' iseffected by means of a pin 88 which is threadably received through aboss in the casing 84 and projects inwardly of the wall 82. Such pin 88projects radially inwardly into engagement with the side walls of thegroove 88, so that as the piston 38 is rotated, the engagement of theinner end of the pin B8 with the cam groove 58 will cause the piston 88to reciprocate within the bore 88. The member 88 is shown as a pin, butit will be understood that the inwardly projecting end of such membercould be constructed with a rotatable bearing ring or ball, if desired.

The piston 88 is constructed with an end wall G4 having an axial openingtherethrough, and the opposite end of such piston is provided withaxially extending spaces 88 communicating with the axial opening. Thespace within the bore 36 is adapted to receive therein separate suppliesof fluid, such as oil, on opposite sides of the wall 84 of the piston,as indicated at 68 and 18. 'I'he fluid supply 18 fills the space withinthe bore behind the piston wall 84 within the spaces 66.

Annular seals 12 are provided in the periphery of the piston 38 toprevent leakage of fluid from one of the supplies 18 to the other alongthe periphery of the piston.

Separate or communicating fiuid reservoirs, of small capacity, areprovided for merely insuring a full supply of iiuid to each Aof theIsupplies 88 and 18 on opposite sides of the piston, and such reservoirsare in the form of separate annular chambers 14 and 18 formed in thecasingr 34. Filling openings having removable plugs therein are providedin the top of the cylinder 34 communicating with each of the chambers 14and 16, if they are separated, or a single opening may be used if theycommunicate.

Communication between chamber 14 and the supply 88, on one side of thepiston 88, is through a passageway 18, disposed adjacent the bottom ofchamber 14, having a resilient check valve assembly 88 disposed therein'so that the fluid from the chamber 14 only enters the supply 88 in theevent of a loss of fluid therein, and such fluid cannot pass from thesupply 88 back into the chamber 14.

A suitable opening A82 having a removable plug 84 therein is providedthrough the 'casing 84 in alignment with the check valve assembly 88, sothat such check valve may be readily installed.

A similar passageway and check valve indicated by the same number 88, asshown in Figure 3, is provided for communicationbetween the chambers 18and the fluid supply 18 at the tions of the partitioning member oppositeside of the piston 88 -for permitting s supply of fluid to enter thesupply region v18. lbut preventing the return of fluid therefrom back tothe chamber 18. I

Thus, a full supply of fluid is insured on both sides of the piston 12,but the fluid cannot return from either of such sides to the reservoirs.

In order to guide the cable 28 as it is wound upon the spool I4 orunwound therefrom, a linearly movableor reciprocable element 88is dis-POsed between and mounted on the `standards 82. Such member 88 is in theform of a tubular casing having radially inward, annular flanges formedon the ends thereof with 'annular sealing means 88 fixed to the facesthereof.

Such member 88 is adapted to be slidably mounted upon another tubularmember 88. which is fixed to the standards 82 and is in axial align-Iment with the bore 88 and in communication with such bore. A separatingring portion 82 is interposed in the member 88 substantially midwaybetween the ends thereof and provides a partition separating such member88 into chambers 84 and 88. The annular surface of the member 82slidably engages the inner surface of the member 88 and is provided withannular sealing means 88 in order to prevent leakage therealong.

The member 88 is of slightly greater diameter than the member 88, sothat annular spaces arc provided therebetween. Such annular spaces areindicated at |8| and |82 on oppomte sides of the partitioning member 82,and, in effect, form expansible and contractlble chambers having annularend wall portions |84 and |88, respectively. The opposite ends of eachof the annular chambers are defined by the annular portions |88 and III,respectively.which are those por- 82 which project within the spacebetween the members 88 and 88.

The chamber 84 is in open communication with the chamber |8| through aplurality of apertures ||2 formed in the member 88; and the chamber 88is in opencommunication with the chamber |82 through a plurality ofsimilar apertures ||4 formed in the member 88 on the op posite side ofthe partitioning member 82.

An axially extending tubular member ||8 is fixed to the wall 88 of thepiston 88, and projects into the member 88 with a space between thewalls thereof. The end of such tubular member |88 is slidably receivedwithin a sealed axial opening III formed in the partitioning member 82,so

. that the open end of the member ||8 projects within the chamber 88.'Ihe opposite open end of the conduit I|8 communicates with the supply18 within the casing 84 through the axial opening or passageway 88formed in the piston 88.

The chamber 84 communicates with the supply 88 throughvthe opening inthecasing 84 and through the space between the outer periphery of themember ||8 and the opening in member 88 adjacent the casing 84.

The member 88 has a housing |28 formed integral therewith, or suitablyfixed thereto. substantially midway between the ends thereof. which isadapted to have rotatably mounted therein a guide pulley |22. may bemounted upon a suitable bali bearing assembly |24 for rotation withinthe housing |28. A removable end closure |28 is fixed to one side of thehousing for the purpose of assembling the -bal1 bearing unit |24 and thepulleys |22.

The housing |28 is also provided with a trans- Such guidepuliey||2 verseguide opening |28 therein which is adapted to receive a bearing sleeve|30. Such bearing sleeve |30 slidably receives therethrougha guide rod|22, which is disposed substantially parallel to the axis ofreciprocation of the member 88 and which has its ends fixed to thestandard 32. The member 88 is thus xed against rotation but mayreciprocate with respect to the spool |4.

'I'he cable 28 is received through suitable inlet and outlet openingsprovided within the housing |20, and is trained about the pulley |22.

It will be understood that the supply 88 illls the casing 84 on-one sideof the piston 38 and also fills the chamber 84 and the chamber |0|.'I'he oil supply 10 fills the casing 34 on the opposite side of thepiston and also'lls the spaces 88, the conduit H8, the chamber 98, andthe chamber |02.

As the spool I4 is driven, the sprocket wheel 54 is synchronouslydriven, thereby rotating the piston 38. Reciprocation of such piston iseffected through the co-operation of the pins 80 with the groove 58. Asthe piston 38 is moved toward the right, viewing Figure 2, the fluidwithin the supply 88 and 84 is forced through the openings I2 into thechamber 0| The pressure of such iluid upon the wall portions |04 and |08causes the member 88 to move to the left, viewing Figure 2. The fluidWithin chamber |02 is then displaced into chamber 98 and passes throughconduit ||8 into the supply portion T0 to fill the space left by thepiston 84 in its movement toward the right. Conversely, the movement ofthe piston 84 toward the left, viewing Figure 2, will force the fluidfrom supply 10 through conduit ||8 into chamber 98 and through apertures||4 into chamber |02, thereby causing movement of the member 88 towardthe right, viewing Figure 2.

Constant rotation of the sprocket 54 in either direction thus causesreciprocation of the element 88 and guides the cable 28 between the endsof the spool |4 as it is being wound thereon or being unwound therefrom.

In order to insure movement of the element 88 to its limits, and toprovide a slight overthrow so that the cable 28 is wound properly on thespool I4. resilient means are provided which are associated with thesupplies 88 and 10 on the opposite sides of the piston in order tomaintain pressures on such separate supplies.

The resilient means for acting upon the supply 88 comprises adisc-shaped member |34 disposed within the member 90 adjacent the outerend of the chamber 98. A resilient sealing cup |38 is fixed to the disc|34 and resiliently engages the inner peripheral surfaces of the member90. A coil spring |38 engages the opposite face of the member |34, withthe opposite end of the spring engaged by a closure plate |40 so as toexert a pressure upon the fluid within the chamber 95. An air vent |42is provided through the member 90, communicating with the space beyondthe member |34.

A similar structure is provided for communication with the supply 10 onthe opposite side of the piston 38, and such structure is mounted withina cylindrical projected portion |44, which may be formed integral withthe casing 34 and which communicates with the bore 38 in the supplyportion 10 through a conduit |48. The disc, sealing cup, end member andvent are given the same numerals as immediately above to describe likeparts, in that their action is the same except that they act upon thefluid in supply 10 through the conduit |48.

Referring to Figure 8, a modified form of the spooler, or level Winder,is shown which is generally indicated at |48. The same numerals are usedto designate corresponding parts in this embodiment as are used above inconnection with the embodiment shown in Figures 1 through '1.

A pair of axially aligned cylindrical members |50 is formed integralwith the upper ends of the standards 32, and have facing open ends. Suchmembers have cylindrical recessses or bores |52 therein which areadapted to telescopically receive the outer ends of the tubular members|54 and |58, respectively. Such members are complementary in shape toeach other and correspond to the casing 34 in the embodiment abovedescribed. The members thus provide a cylindrical bore |82, within whicha piston |84 is rotatably and slidably disposed.v Such piston |84corresponds to the piston 38, above described, and has a similar groove58 formed in the periphery thereof. A pin projects int'o the groove fromthe housing formed by sections |58 and |80, so that upon rotation of thepiston |84 it is caused to reciprocate within the bore |82 through theco-operation of the pin 80 with the continuous groove 58.

'I'he outer end of one of the members |54 or |58 is splined to one ofthe members |50, as indicated at |88, so that the members |54, |58 andthe casing are held against rotation with respect to the standards 32,but may slide axially with respect thereto.

An air vent |81 is provided in one of the members |50, and the othermember |50, having the Wheel 54 attached thereto, may vent through theaxial opening therein.

The sprocket wheel 54 is connected through a suitable stub'shaft |88,which projects through a sealed opening in the end of the` adjacentmember |50 with an axially disposed drive member |10. Such drive member|10 has a cylindrical bore therein with a splined inner surface which isadapted to reciprocably receive therein the splined end of a shaft |12which is formed integral with or otherwise suitably secured to one ofthe ends of the piston |84. Thus, the splined connection between themembers |10 and |12 causes the piston |84 to rotate upon driving thesprocket wheel 54, but permits relative axial sliding movementtherebetween.

A tubular guide member |14 is fixed to the opposite end of the oppositemember |50 in axial alignment With the member |10. A guide rod |18 isxed to the opposite side of the piston |84, and is slidably receivedWithin the tubular member |14. The members |10 and |14 have radialprojections |18 formed on the inner ends thereof, and annular sealingmeans |80 are provided in the peripheral surface thereof which slidablyengage the member |54 as it is axially reciprocated.

'I'he elements thus provide separate oil chambers |82 and |84 onopposite sides of the piston |84 within the casing. The members |54 andthe radial surface of the projection |18 form an annular chamber |88around the member |12, in communication with the supply |82. The member|58 forms a similar chamber |88 with the radial face of the projection|18 of member |14, Vand communicates with the uid supply chamber |84.The chambers |82, |88 and |84 and |88 are filled with oil, so that asthe wheel 84 is rotated, the piston |84 is correspondingly rotated,causing the piston to reciprocate axially. This reciprocation causesdisplacement of the iluid within chambers |22 and |04.

Itwillthusbeseenthatasthepiston itlis caused to move to the left,viewing Figure 8, the fluid from within chamber Il! is displaced intochamber l, and causes the chamber Ill to expand, `thus moving the guidepulley |22 to the right, viewing Pleure 8. When the piston i movestoward the right, viewing Figure 8. itvwill be seen that the uid isdisplaced from the chamber i into chamber ill, causing the pulley |22with the homing to move to the left, viewing Figure 8. As the huid isdisplaced from chamber |82. the iluid from chamber ill will pass intothe chamber lll: and, conversely, when the iiuid is displaced fromchamber i, the iluid from chamber il! will illl chamber |82.

In Figure 9, another modified form of the present invention isillustrated in which the spooling device, or level winder, is generallyindicated at lll. Such spooling device ill is generally similar to thatshown in Figure 2, except that the iluid chambers and piston means areof different form so that the overall length of the device is less thanthat of the embodiments described above and may thus be located in asmaller space.

The same reference numerals as used in the embodiment described inFigures 1 through 7 have been used here to indicate corresponding parts.It will thus be seen that the member 90 is mounted on the standards 32and fixed against rotation with respect thereto. 'Ihe drive member l2projects through one end thereof into one end oi' the member Il. It isthen connected to a member Il2, which in structure is generally similarto the piston Il, vabove described. Such member |22 is formed with thegroove 58 therein, which is engaged by a pin 6l to cause thereciprocation of the member |92- Such pin 6l, not shown in thisembodiment, may project through an opening formed in the member 90 andbe ilxed thereto. An air vent I may be provided vin the end of themember 90, so as to permit free axial movement of the member |92.

The member |92 has an integral, axially extending shaft III havingspaced pistons |98 and i, secured to the outer ends thereof. That shaftportion 2li connecting the members |88 and i is preferably of a smallerdiameter than the major shaft portion |96. 'Ihe members |98, i and shaftportion 2li are preferably formed separate from each other, so that theymay readily be secured together and mounted within the member Il in theposition shown.

Separate iluid chambers 2.2 and 204 are thus formed between thepartitioning member 92 and piston III and piston |99, respectively. Thesupply chamber 2.2 communicates with the expansible chamber ill throughthe radial openings ||2; and the chamber 2 communicates with the chamber|l2 through the radial openings ill.

As the wheel M rotates, it will thus be seen that the pistons ill and|99 are caused to rcciprocate within the member 9|. When the pistons Iand i" are moved to the left, viewing Figure 9, the iluid from chamber2M passes into the chamber 2li and causes the housing 8B, together withthe pulley |22 which carries the cable 2l, to move to the right, viewingFigure 9. When the pistons are moved in the opposite direction, theiluid enters chamber lill, causing the housing l. to move in theopposite direction.

'It will be appreciated, in all of the embodiments described above, thatby properly proportioning the relative dimensions oi' the supplychambers such as Il and 0l with the volumes and conventional hydraulicsystem employing the.

necessary pump, check valves, needle valves, pilot valves and a four-wayautomatic valve, not only because such conventional system is morecostly. but such system does not operate properly. The reason for thisis that the pump, in such a systern, is not instantly responsive to theturning of the cable drum. A lag occurring while the pump is building upa working pressure would throw the reciprocating action out -of stepwith the revolving drum. 'Ihis could be caused by starting from a deadstop or by a loss of time in the operation of the check valves or theoperation of pilot valves which, in turn, actuate the automatic valvebefore a start could be made at the actuating end of the circuit to movethe piston and thus guide the cable across the face of the drum. Forproper action, these movements must be timed exactly. In theconventional system mentioned it is not possible to overcome the timelosses mentioned, especially with a slot turning pump.

What is claimed is:

l. In a device of the type described, a linearly movable element, arotatable element, and means for moving said first-named element in alinear path in response to rotative movement of said second-namedelement, said last-named means including an hydraulic iiuid displacementsystem, said system including a casing containing separate supplies offluid, piston means disposed within said casing for reciprocation androtation therein to displace fluid within said casing in oppositedirections therein, means forming opposite iluid chambers associatedwith said firstnamed element, and means communicating said separatesupplies of fluid with said opposite fluid chambers, respectively, andmeans operatively connecting said rotatable element with said piston torotate and reciprocate said piston upon rotation of said rotatableelement.

2. In a device of the type described, a linearly movable element, arotatable element, and means for moving said first-named element in alinear path in response to rotative movement of said second-namedelement, said last-named means including a closed hydraulic iiuiddisplacement system, said system including a casing containing separatesupplies of fluid, piston means disposed within said casing forreciprocation and rotation therein to displace fluid within said casingin oppositel directions therein. means forming opposite fluid chambersassociated with said first-named element, and means communieating saidseparate supplies of iluid with said opposite iluid chambers,respectively, and means operatively connecting said rotatable elementwith said piston to rotate and reciprocate said piston upon rotation ofsaid rotatable element. 3. In a device of the type described, a linearlymovable element, a rotatable element, and means for moving saidilrst-named element in a linear path in response to rotative movement ofsaid second-named element, said last-named means including an hydraulicfluid displacement system, said system including a casing containingseparate supplies of fluid, piston means disposed posite expansible andcontractible iluidchambers i associated with said mst-named element, andmeans communicating said separate supplies of iiuid with said oppositefluid chambers, respectively, and means operatively connecting saidrotatable element with said piston to rotate and reciprocate said pistonupon rotation of said rotatable element to displace fluid in onedirection within said `casing into one of said chambers, the lluid inthe other chamber being displaced into the casing from the oppositedirection. Y

4. In a device of the type described, a linearly movable element, arotatable element, and means for moving said first-named element in alinear path in response to rotative movement of said second-namedelement, said last-named means including an hydraulic uid displacementsystem, said system including a casing containing a supply of fluid,piston means disposed within said casing for reciprocation and rotationtherein to displace iluid within said casing on opposite sides of saidpiston means, means forming opposite expanslble and contractible uidchambers associated with said first-named element, and uid oonduitsinterconnecting the interior of said casing on opposite sides of saidpiston means with said opposite iluid chambers, respectively, and meansoperatively connecting said rotatable element with said piston to rotateand reciprocate said piston upon rotation of said rotatable element todisplace fluid from one side of said piston means into one of saidchambers, the fluid in the other chamber being displaced into saidcasing on the opposite side of said piston.

5. ln `a device of the type described, a linearly movable element, arotatable element, and means for moving said rst-named element in a.linear path in response to rotative movement of said second-namedelement, said last-named means including an hydraulic fluid displacementsystem, said system including a casing containing a supply to fluid,piston means disposed within said casing for reciprocation and rotationtherein to displace fluid within said casing in opposite directionstherein, means forming opposite fluid chambers associated with saidilrst-named element, and means communicating the interior of said casingon separated sides of said piston means with said opposite fluidchambers, respectively, resilient means acting upon the fluid in saidcasing on opposite sides of said piston means to permit overthrow ofsaid first-named element upon reaching the end of its travel, and meansoperatively connecting said rotatable element with said piston to rotateand reciprocate said piston upon rotation of said rotatable element.

6. In a device of the type described, a reciprocating element, arotatable element, and means for reciprocating said ilrst-named elementin response to rotation of said second-named element, said last-namedmoans including an hydraulic iluid displacement system, said systemincluding a casing containing a supply of fluid, piston means disposedwithin said casing for reciprocation and rotation therein to displaceiluid within said casing in opposite directions therein, means formingopposite fluid chambers associated with said ilrstnamed element, andmeans communicating the interior of said casing on separated sides ofsaid piston means with said opposite iluid chambers, respectively, andmeans operatively connecting said rotatable element with said piston torotate and reciprocate said piston upon4 rotation of saidrotatable-element.

7. In a device ofthe type described, a reciprof eating element, arotatable element, and means for reciprocating said first-named elementin response to rotation of said second-named element, said last-namedmeans including an hydraulic duid displacement system, said systemincluding a casing containing a supply. of iluid, piston means disposedwithin said casing for reciprocaltion and rotation therein to displacefluid within said casing inopposite directions therein, means formingopposite expansible and contractlble fluid chambersl associated withsaid first-named element, and means communicating the interior ot saidcasing on separated sides of said piston means with said opposite fluidchambers, respectively, and means operatively connecting said rotatableelement with said piston to rotate and reciprocate said piston uponrotation of said rotatable element to displace iluid in one directionwithin said casing into one of said chambers, the fluid in the otherchamber being displacedinto the casing from the opposite direction.

8. A power winch construction comprising, in combination, a spool havinga cable wound therearound, driving means for rotating said spool, areciprocable guide element having a. cable receiving guide portion andmovable longitudinally of said spool between the ends thereof, arotatable element, means operatively connecting said rotatable elementwith said driving means for synchronous rotation therewith, and meansfor reciprocating said guide element in response to rotation of saidrotatable element, said last named means including an hydraulic iluiddisplacement system, said system including a casing containing separatesupplies of iluld, piston means disposed within said casing forreciprocation and rotation therein to displace fluid within said casingin opposite directions therein, means forming opposite uid chambersassociated with said ilrst named element, and means communicating saidseparate supplies of fluid with said opposite uid chambers,respectively, and means operatively connecting said rotatable elementwith said piston means to rotate and reciprocate said piston means uponrotation of said rotatable element.

9. A power winch construction comprising, in combination, a spool havinga cable wound therearound, driving means for rotating said spOol, areciprocable guide element having a cable receiving guide portion andmovable longitudinally of said spool between the ends thereof, arotatable element, means operatively connecting said rotatable elementwith said driving means for synchr-cnous rotation therewith, and meansfor reciprocating said guide element in response to rotation of saidrotatable element, said last named means including an hydraulic fluiddisplacement system, said system including a casing containing separatesupplies of iiuid, piston means disposed within said casing forreciprocation and rotation therein to displace fluid Within said casingin opposite directions therein, means forming opposite expansible andcontractible fluid chambers associated with said rst named element, andmeans communicating said separate supplies of uid with said oppositeiluid chambers, respectively, and means operatively connecting saidrotatable element with said piston to rotate and reciprocate said pistonupon rotation of said rotatable element to displace iluid in onedirection Within said casing into one of said chambers, the fluid in theother chamber being displaced into the casing from the oppositedirection.

10. A power winch construction comprising, in combination, a spoolhaving a cable wound therearound, driving means for rotating said spool,a reciprocable guide element having a cable receiving guide portion andmovable longitudinally of said spool between the ends thereof, arotatable element, means operatively connecting said rotatable elementwith said driving means for synchronous rotation therewith, and meansfor reciprocating said guide element in response to rotation oi saidrotatable element, said last named means including an hydraulic iluiddisplacement system, said system including a casing containing a supplyof fluid, piston means disposed within said casing for reciprocation androtation therein to displace fluid within said casing on opposite sidesof said piston means, means forming opposite expansible and contractibleiluid chambers associated with said first named element, and iluidconduits interconnecting the interior of said casing on opposite sidesof said piston means with said opposite iluld chambers respectively,vand means .operatively connecting said rotatable element with saidpiston to rotate and reciprocate said piston upon rotation of saidrotatable element to dispiace iluid from one side of said piston meansinto one of said chambers, the duid in the other chamber being displacedinto said casing on the' opposite side of said piston.

1l. A power winch construction comprising, in combination, a spoolhaving a cable wound therearound, driving means for rotating said spool,a reciprocable guide element having a cable receiving guide portion andmovable longitudinally of said spool between the ends thereof, arotatable element, means operatively connecting said rotatable elementwith said driving means for synchronous rotation therewith, and meansfor reciprocating said guide element in response to rotation of saidrotatable element, said last named means including an hydraulic fluiddisplacement system, said system including a casing containing a supplyof iluid, piston means disposed within said casing for reciprocationancl rotation therein to displace iluid within said casing in oppositedirections therein, means forming opposite iluid chambers associatedwith said first named element, means communicating the interior of saidcasing on opposite sides of said piston with said opposite fluidchambers respectively, resilient means acting upon the fluid in saidcasing on opposite sides of said piston means to permit overthrow ofsaid ilrst named element upon reaching the end o! its travel, and meansoperatively connecting said rotatable element with said piston to rotateand reciprocate said piston upon rotation of said rotatable element.

12. In a device of the type described, 'a linearly movable element, arotatable element, and means for moving said first named element in alinear path in response to rotative movement of said second namedelement, said last named means including an hydraulic iluid displacementsystem, said system including a casing containing separate supplies oi'iluid, piston means disposed within said casing for reciprocation androtation therein to displace iluid within said casing in oppositedirections therein, means forming opposite iluidchambers associatedwlthsaid nrst named element, means communicating said separate suppliesof iluid with said opposite uid chambers, respectively, iluid reservoirmeans asmovable element. a rotatable element, and means tor moving saidilrst named element in a linear path in response to rotative movement ofsaid second named element, said last named means including an hydraulicfluid displacement system, said system including a casing containing asupply of iluld, piston means disposed within said casing forreciprocation and rotation therein to displace :luid within said casingin opposite directions therein, means forming opposite duid chambersassociated with said ilrst named element, and means communicating theinterior ot said casing on opposite sides oi' said piston with saidvopposite iluid chambers, respectively, iluid reservoir meanscommunicating with the interior of the casing von opposite sides of saidpiston, check valves interposed between said reservoir means and theinterior of said casing on opposite sides of said piston, resilientmeans acting upon the iluld in said casing on opposite sides of saidpiston means to permit overthrow of said ilrst named element uponreaching the end of its travel, and means operatively connecting saidrotatable element with said piston to rotate and reciprocate said pistonupon rotation of said rotatable element.

14. A power winch` construction comprising, in combination, a spoolhaving a cable wound therearound, driving means for rotating said spool,a reciprocable guide element having a cable receiving guide portion andmovable longitudinally of said spool between the ends thereof, arotatable element, means operatively connecting said roi said casingi'or reciprocation and rotation therein to displace iluid within saidcasing in opposite directions therein, means forming opposite iluidchambers associated with said first named element, and meanscommunicating the interior of said casing on opposite sides of saidpiston with said opposite fluid chambers, respectively, fluid reservoirscommunicating with the supply within said easing on opposite sides ofsaid piston, check valves disposed between said reservoirs and saidsupply on opposite sides of said piston, resilient means acting upon theiluid in said casing onopposite sides ot said piston means `to permitoverthrow of said rst named element upon 1 reaching the end of itstravel, and means operatively connecting said rotatable element withsaid piston to rotate and reciprocate said piston upon rotation of saidrotatable element.

EDWARD n BAaaE'rr.

